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Alternator Test

  1. Turn ignition on. If charge indicator light on instrument panel comes on, go to step 3).
  2. If light is off, disconnect alternator connector (terminals "L" and "S"). Ground terminal "L". If light comes on, repair or replace alternator and/or replace regulator. If light remains off, replace indicator bulb, reconnect alternator connector and retest.
  3. Start and run engine at idle. If charge indicator light is dim, flickers or remains on (bright), repair or replace alternator. If light goes off, run engine at 1500 RPM with headlights on. If light comes on, repair or replace alternator.
  4. If light remains off, measure voltage at terminal "B" with engine running at 1500 RPM. If more than 15.5 volts are present, replace regulator. If voltage is 13-15 volts, alternator and regulator are okay. Ensure alternator output amperage is as specified. See ALTERNATOR OUTPUT AMPERAGE SPECIFICATIONS  table.
ALTERNATOR OUTPUT AMPERAGE SPECIFICATIONS

Application Output Amps @ RPM
Sentra 65 @ 2500
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